U.S. patent number 9,578,969 [Application Number 14/845,277] was granted by the patent office on 2017-02-28 for adjustable footrest ring for chair.
This patent grant is currently assigned to DONGGUAN KENTEC OFFICE SEATING CO., LTD.. The grantee listed for this patent is Chih-Cheng Su. Invention is credited to Chih-Cheng Su.
United States Patent |
9,578,969 |
Su |
February 28, 2017 |
Adjustable footrest ring for chair
Abstract
The invention provides an adjustable footrest ring for a chair
with a central post. The invention includes an inner sleeve, a
quick-release handle, a support frame and a ring. The inner sleeve
is used for being put around the central post and has an outer
threaded surface, a through slot and a pair of passing holes below
the outer threaded surface. The quick-release handle is formed with
a through hole at an end thereof. The through hole corresponds to
the passing holes for being passed through by a bolt. The inner
sleeve is shrunken when the bolt is tightened and the quick-release
handle is closed. The support frame has an outer sleeve and support
rods radially extending therefrom. An inner threaded surface is
formed inside the outer sleeve so as to screw the outer sleeve onto
the inner sleeve. The ring is connected to outer ends of the
support rods.
Inventors: |
Su; Chih-Cheng (Dongguan,
CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Su; Chih-Cheng |
Dongguan |
N/A |
CN |
|
|
Assignee: |
DONGGUAN KENTEC OFFICE SEATING CO.,
LTD. (Dongguan, CN)
|
Family
ID: |
56896360 |
Appl.
No.: |
14/845,277 |
Filed: |
September 4, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47C
7/5064 (20180801); A47C 7/506 (20130101); A47C
7/52 (20130101); A47C 7/004 (20130101) |
Current International
Class: |
A47C
7/50 (20060101); A47C 7/00 (20060101) |
Field of
Search: |
;297/423.25,423.38,423.24,423.4,423.1,451.5,463.1,463.2 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Glessner; Brian
Assistant Examiner: Barlow; Adam
Claims
What is claimed is:
1. An adjustable footrest ring for a chair with a central post,
comprising: an inner sleeve, used for being put around the central
post, an outer threaded surface being formed on the inner sleeve,
having a through slot, a pair of passing holes being provided below
the outer threaded surface; a quick-release handle, being formed
with a through hole at an end thereof, the through hole
corresponding to the passing holes for being passed through by a
bolt, wherein the inner sleeve is shrunken when the bolt is
tightened and the quick-release handle is closed; a support frame,
having an outer sleeve and support rods radially extending
therefrom, an inner threaded surface being formed inside the outer
sleeve so as to screw the outer sleeve onto the inner sleeve; and a
ring, connected to outer ends of the support rods.
2. The adjustable footrest ring of claim 1, wherein the pair of
passing holes is located beside the through slot.
3. The adjustable footrest ring of claim 1, wherein the outer
threaded surface is a frustum of a cone in shape, and a bottom
diameter is greater than a top diameter.
4. The adjustable footrest ring of claim 3, wherein the inner
threaded surface is a frustum of a cone in shape, and a bottom
diameter is greater than a top diameter.
5. The adjustable footrest ring of claim 1, wherein the bolt is of
a T-shape.
6. The adjustable footrest ring of claim 1, wherein the bolt is
screwed with a nut.
7. The adjustable footrest ring of claim 1, wherein the support
rods are four in number.
8. The adjustable footrest ring of claim 1, wherein the ring
comprises a ring body connected to the support rods and anti-slip
pads on the ring body.
9. The adjustable footrest ring of claim 1, wherein an inner end of
each of the support rods is inserted into one of first fixing holes
in the outer sleeve.
10. The adjustable footrest ring of claim 1, wherein the outer end
of each of the support rods is inserted into one of second fixing
holes in the ring.
Description
BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to chairs, particularly to a chair with a
footrest.
2. Related Art
Office chairs with a cushion elevation mechanism and/or flexible
back have been very popular. Many chairs are provided with a
flexible back with tilt flexibility to satisfy various requirements
of users. Although existing chairs are very comfortable for users,
almost all office chairs do not provide a footrest for supporting a
user's feet to relax a user's his or her legs.
Even if some office chairs provide a footrest, but the position of
the footrest cannot be adjusted or is hard to be adjusted. Users
with different height need different positions of the footrest. A
user will feel uncomfortable if the footrest cannot be set a proper
position.
SUMMARY OF THE INVENTION
An object of the invention is to provide an adjustable footrest
ring for a chair with a central post, which allows position of the
footrest on the central post to be easily adjusted to satisfy
various users' requirements.
To accomplish the above object, the adjustable footrest ring of the
invention includes an inner sleeve, a quick-release handle, a
support frame and a ring. The inner sleeve is used for being put
around the central post and has an outer threaded surface, a
through slot and a pair of passing holes below the outer threaded
surface. The quick-release handle is formed with a through hole at
an end thereof. The through hole corresponds to the passing holes
for being passed through by a bolt. The inner sleeve is shrunken
when the bolt is tightened and the quick-release handle is closed.
The support frame has an outer sleeve and support rods radially
extending therefrom. An inner threaded surface is formed inside the
outer sleeve so as to screw the outer sleeve onto the inner sleeve.
The ring is connected to outer ends of the support rods.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of the invention assembled with a
chair;
FIG. 2 is an exploded view of the invention;
FIG. 3 is an assembled view of the invention; and
FIGS. 4-6 are side views showing the movement of the invention in
operation.
DETAILED DESCRIPTION OF THE INVENTION
Please refer to FIGS. 1 and 2. As shown, the footrest ring of the
invention is installed onto a central post 101 of a chair 100.
As shown in FIG. 2, the invention includes an inner sleeve 1, a
quick-release handle 4, a support frame 2 and a ring 3. The inner
sleeve 1 is used for being put around the central post 101. An
outer threaded surface 12 is formed on the inner sleeve 1. The
inner sleeve 1 has a through slot 11 so as to make the inner sleeve
1 have a C-shape cross-section. A pair of passing holes 13 is
provided below the outer threaded surface 12 and beside the through
slot 11. The inner sleeve 1 can be normally keep its original shape
or forcedly shrunken because of the through slot 11. Preferably, as
shown in the FIG. 2, the outer threaded surface 12 can be a frustum
of a hollow cone whose bottom diameter is slightly greater than its
top diameter.
The quick-release handle 4 is formed with a through hole 41 at an
end thereof. The through hole 41 corresponds to the passing holes
13 for being passed through by a bolt 5. The bolt 5 passes through
the through hole 41 and the passing holes 13 to screw with an
anti-release nut 6. In the shown embodiment, the bolt 5 is of a
T-shape for being rotated by a hand. The inner sleeve 1 can be
shrunken to clamp the central post 101 when the bolt 5 with the nut
6 is tightened and the quick-release handle 4 is closed.
Referring to FIG. 2 again, the support frame 2 includes an outer
sleeve 21 and a plurality of support rods 32 radially extending
therefrom. Each support rods 32 has an identical length. An inner
threaded surface 22 is formed inside the outer sleeve 21 so as to
be able to screw the outer sleeve 21 onto the inner sleeve 1. In
the shown embodiment, the support rods 32 are fastened to the outer
sleeve 21 by separately inserting the support rods 21 into first
fixing holes 23 in the outer sleeve 21. Of course, other fastening
manners are also available, for example, welding or screwing. In
correspondence to the shape of the outer threaded surface 12, the
inner threaded surface 22 is conical in shape. Because of the conic
shapes of the threaded surfaces 12, 22, the outer sleeve 21 can be
firmly screwed onto the inner sleeve.
Please refer to FIG. 3. The ring 3 includes a ring body 31 which
connects to outer ends of the support rods 32 and anti-slip pads 33
on the ring body 31. The ring body 31 is provided with second
fixing holes 311 for being inserted by the support rods 21.
Alternatively, as abovementioned, the junction between the support
rods 21 and the ring body 31 may be welding, screwing or any other
fastening manners. As a result, the ring 3 is assembled with the
outer sleeve 21 so as to rotate conjunctively.
Please refer to FIG. 4. The footrest ring of the invention is
fastened around a central post 101 of a chair 100 by pressing down
the quick-handle so that the inner sleeve 1 cannot be moved any
longer. The support frame 2 is fastened onto the inner sleeve 1 by
screwing the inner and outer threaded surfaces 12, 13. When a user
wants to adjust the position of the footrest ring, as shown in FIG.
5, loosen the outer sleeve 21 with respect to the inner sleeve 1
and open the quick-release handle 4, such that the inner sleeve 1
can be slid along the central post 101. As shown in FIG. 6, when
the footrest ring has been moved to a desired position, close the
quick-release handle 4 and screw up the outer sleeve 21 with the
inner sleeve 1 to re-position the footrest ring.
It will be appreciated by persons skilled in the art that the above
embodiment has been described by way of example only and not in any
limitative sense, and that various alterations and modifications
are possible without departure from the scope of the invention as
defined by the appended claims.
* * * * *